| Robust lossless data hiding based on block gravity center for selective authentication Recent countries visiting this post |  |
 | 8 | United States |
 | 1 | |
 | 1 | Pakistan |
| Robust lossless data hiding based on block gravity center for selective authentication Recent countries visiting this post | |
| 8 | United States |
| 1 | |
| 1 | Pakistan |